Applying super zix on greasy scalp

I was just wondering about the effectiveness of applying zix on a greasy scalp- it would make sense to me that the solution would absorb better into a clean scalp after a shower- is this the case? I usually do this but then my scalp gets quite greasy by the evening so I tend not to apply any zix again. Would I be losing out by skipping the evening routine?
Thanks
Phil